docs: Update ChangeLog for 6.20231216.0
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+2023-12-16 mintsuki <mintsuki@protonmail.com>
+
+ *** Release 6.20231216.0 ***
+
+ Noteworthy changes compared to the previous release, 6.20231210.0:
+
+ New features:
+ - Added a `--print-datadir` switch to the `limine` program in order
+ to print the directory where Limine files are stored when installed
+ on a host distro.
+
+ Miscellaneous:
+ - General improvements to the `--help` texts for the `limine` program.
+
2023-12-10 mintsuki <mintsuki@protonmail.com>
*** Release 6.20231210.0 ***
